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VWZS
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Viconics VWZS Guide Specifications

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Viconics Wireles Zoning System Engineering Guide
Specification
Viconics Wireless Zoning System Engineering Guide Spec
1.01 System Description – The Viconics Wireless Zoning System (VWZS) shall provide a simple and
1.02 Quality Assurance - The control system shall be manufactured within a systems certified ISO-9001 and ISO-14001. Please see the Equipment section for industry approvals and specifications.
Part 2 – Equipment
2.01 General - The VZ7656x1000W Rooftop controller shall be designed for equipment control based on heating and cooling demands from the zone controller(s) (VZ7260x5x00W). The packaged rooftop or heat pump system controller VZ7656 shall also provide logic and required inputs/outputs to control
system specific static pressure. The VZ7260F5x00W zone controllers shall be designed for local pressure dependent VAV control.
Communication Protocol – The control system shall communicate using the Viconics’ profile of the ZigBee 2.4GHz with data rates up to 250 kbps. The protocol must support full handshaking for information transmission reliability. The protocol must support automatic multiple topologies including star, peer-to-peer and mesh. A site survey using the VST5000W5000W wireless communicating site survey tools is recommended to ensure proper communication and if required, the installation of VRP5000W5000W repeaters. Typical communicating range including one separation (standard gypsum wall) is approximately 30 feet in between controls. Typical communicating range direct line of sight can be up to 100 feet in between controls.
Scalability – The system shall be fully scalable in terms of number of zone controllers and Rooftop Unit controllers used on the same Personal Area Network (PAN ID).
The main network coordinator for the wireless the IEEE 802.15.4/ZigBee network can be either:
• The VZ7656x1000W RTU/HP controller for (SA) Stand-Alone applications: Where zoning system(s) are self sufficient for communication and no external communication is required. In this layout, the VZ7656x1000W RTU/HP controller shall act as the network coordinator.
• The Viconics Wireless Gateway (VWG / Jace-Driver for (NS) Networked Systems applications: Where zoning system(s) (more than one can be installed in a typical building application) are required to communicate with the Viconics VWG / Jace-Driver set. In this layout, the Viconics VWG / Jace-Driver acts as the network coordinator. System shall support supervisory functionality (supplied by others) which will
support centralized scheduling, alarming and trending found commonplace amongst today’s advanced
automation systems.
Systems not capable of supporting supervisory BACnet workstations shall not be acceptable.
VZ7656x1000W Wireless Rooftop or Heat Pump Controller
The Rooftop unit Controller shall be:
VZ7656R1000W: Up to two heating and two cool stages, single fan speed output, 0-10Vdc output for
bypass damper or variable-frequency drive (VFD). VZ7656F1000W: Modulating 0-10Vdc heating / 2 cooling stages, single fan speed output, 0-10Vdc output
for bypass damper or variable-frequency drive (VFD). VZ7656E1000W: Up to two heating and two cooling stages, single fan speed output, 0-10Vdc output for
economizer actuator, 0-10Vdc output for bypass damper or variable frequency drive (VFD), indoor air quality sequence (IAQ)
The Heat Pump Controller shall be: VZ7656H1000W: 2 stage compressor with reversing valve and auxiliary heat, single fan speed output, 0-
10Vdc output for bypass damper or variable-frequency drive (VFD)
General VZ7656 Specifications:
VZ7656 controller shall be capable of controlling single or multistage HVAC units with automatic
changeover based on zone demands using the wireless Viconics’ profile of ZigBee wireless communication.
The controller shall have the option of analyzing the PI heating or PI cooling demands from the
zones the following ways depending on the application:
1. Highest: The highest PI heating or PI cooling demand from the selected voting zones shall dictate heating or cooling operation of the Rooftop Unit controller.
2. Average of the three (3) highest demands: The average of the three (3) highest PI heating or PI cooling demands from the selected voting zones will dictate heating or cooling operation of the Rooftop Unit controller.
3. Average of the five (5) highest demands: The average of the five (5) highest PI heating or PI cooling demands from the selected voting zones will dictate heating or cooling operation of the Rooftop Unit controller.
The controller shall be capable of maintaining the system static pressure set point using
integrated proportional static pressure logic to modulate a bypass damper. A pressure transducer with a 0-5Vdc output shall be wired directly to the VZ7656 controller. The controller shall have an adjustable static pressure sensor range from 0-5” W.C. The control will output an analog signal from 0-10Vdc to the bypass damper. A control system requiring a separate bypass damper controller or separate sensors to display the bypass damper position is not acceptable.
The controller shall have EEPROM memory to prevent a loss of programming due to power
outage as well as a minimum of 6-hour reserve time for the internal clock.
The controller shall be capable of operating the packaged unit even if there is a loss of
communication with the zone controllers. The packaged unit will run in heating or cooling based on the return air temperature. If there is no return air sensor installed, the controller shall
Global Unocc
Override
System mode
setting
Schedule setting
Clock setting
Levels
Override **
….Y/N
Sys mode
set Y/N
Schedule
set Y/N
Clock
set Y/N
0
Yes access
Yes access
Yes access
Yes access
1
Yes access
No access
No access
Yes access
2
No access
No access
No access
Yes access
automatically revert to the internal temperature sensor. Control systems that cannot operate the packaged during a loss of communication with the zones are not acceptable.
The VZ7656 controller shall be 7 day programmable with a choice of 2 or 4 events per day.
Control systems that require an external time clock are not acceptable.
The controller shall have an adjustable (from 0 to 5 minutes) minimum On/Off operation time of
cooling & heating stages to prevent cycling.
The controller shall have a connection for an outdoor air temperature sensor. The outdoor air
temperature readings shall be used to lockout the system heating or cooling modes to prevent equipment cycling as well as to lockout zone auxiliary heating (duct furnace and/or perimeter heater).
The controller shall have a connection for a remote discharge air temperature sensor. The
discharge air temperature readings shall be used for monitoring purposes and can be viewed directly on the LCD screen. The controller must have an adjustable discharge air heating high-limit range of 70°F to 150°F (21°C to 65°C) as well as a discharge air cooling low-limit range of 35 to 65°F (2.0°C to 19.0°C).
The controller shall have a connection for a remote return air temperature sensor. The
return air temperature readings shall be used for monitoring purposes as well as a backup to controlling the RTU in case of a loss of communication with the zone controllers. The return air temperature can be viewed directly on the LCD screen. The controller must have an adjustable return air heating high limit and return air cooling low limit.
The controller shall have a lockable keypad with the following three lockout levels to prevent
changes to the settings from the keypad:
The controller shall have the ability to set the programmed occupied schedule time as the time at
which the desired occupied temperature set points will be attained at the zones. The controller shall automatically optimize the equipment start. This progressive recovery feature can be enabled or disabled.
The controller must have a programmable digital input that can be setup for the following
functions:
1. Service: a backlit flashing “SERVICE” alarm will be displayed on the controller LCD screen when the input is energized.
2. Filter: a backlit flashing “FILTER” alarm will be displayed on the controller LCD screen when the input is energized. The input can be tied to a differential pressure switch to monitor filter status.
3. Remote NSB: Timer clock input for remote night-setback. This function shall automatically disable the internal scheduling.
4. Remote OVR: Temporary occupancy remote contact. This function shall disable all override menu functions.
The controller shall have “Smart Fan” operation to reduce energy consumption during unoccupied
periods.
The controller shall a fan delay that extends fan operation by 60 seconds after calls for heating or
cooling stage operation ends (can be enabled or disabled by the local keypad).
The controller shall have a configurable SPST output relay that can be used for lighting, exhaust
fan or fresh air control.
Packaged unit controller model dependent specifications: VZ7656R1000W: Up to two heating and two cool stages, single fan speed output, 0-10Vdc output for
bypass damper or variable-frequency drive (VFD). VZ7656F1000W: Modulating 0-10Vdc heating / 2 cooling stages, single fan speed output, 0-10Vdc output
for bypass damper or variable-frequency drive (VFD). Specifications
The VZ7656F1000W shall have a configurable minimum supply temperature between 50 °F to 72
°F (10 °C to 22 °C) to be maintained during occupied mode. This parameter shall only be active when the controller is in occupied mode, in heating mode and if the outdoor temperature is low enough to prevent heating stage lockout.
VZ7656E1000W: Up to two heating and two cooling stages, single fan speed output, 0-10Vdc output for economizer actuator, 0-10Vdc output for bypass damper or variable frequency drive (VFD), indoor air quality sequence (IAQ).
Specifications
The VZ7656E1000W shall have capable of controlling the economizer for free cooling depending
on the outside air temperature.
If a fresh air station is used to measure CFM, the VZ7656E1000W shall have a 0-5 Vdc analog
input for a fresh air station transmitter to enable the Min/Max CFM control logic.
If CO2 levels must be maintained, the VZ7656E1000W can receive CO2 demands from the
VZ7260x5x00W controls and control the economizer to maintain a minimum and maximum C02 range. The default minimum and maximum CO2 set points shall be 800ppm and 1200ppm respectively.
The Heat Pump Controller shall be: VZ7656H1000W: 2 stage compressor with reversing valve and auxiliary heat, single fan speed output, 0-
10Vdc output for bypass damper or variable-frequency drive (VFD)
Lockout
Keypad lockout levels. Default: 0 = No Lockout
Levels
Occupied temperature set points
Local Override Only
Global Override Access
0
Yes access
Yes access
Yes access
1
Yes access
Yes access
No access
2
Yes access
No access
No access
3
No access
No access
No access
Wireless Communicating Zone Controller
VZ7260 Zone Controller –
The zone controller shall be capable of controlling a local VAV analog damper actuator as well as
a local duct furnace and on/off or PWM perimeter heater (if necessary). The zone controller shall also be capable of auto-changeover based on the central VZ7656 controller signal.
The zone controller shall be capable of modulating the local VAV damper using integrated
damper control logic. The output signal shall be 0-10Vdc to modulate any standard analog damper actuator. The minimum damper position and maximum damper position shall be programmed directly on the controller keypad. Control systems that are mounted next to the damper or require mechanical damper stops are not acceptable.
The zone controller shall have an output to control a duct furnace. The zone controller shall also
have an output for an on/off or PWM (SSR) perimeter heater.
The zone controller shall achieve accurate temperature control using a PI proportional-integral
algorithm. Traditional differential-based controllers are not acceptable.
The zone controller shall communicate wirelessly with the VZ7656x1000W controller using the
Viconics profile of ZigBee.
The zone controller shall have adjustable PI heating and PI cooling weight from 0% to 100% in
25% increments to allow certain zones a higher priority versus other zones.
The zone controller shall have a 0-10Vdc input for a CO2 transmitter for monitoring purposes or
to be used in conjunction with the VZ7656E1000W economizer model for CO2 level control.
The zone controller shall be compatible with the VI-PIR “passive infrared” occupancy sensor to
enable a “Stand-by” occupancy mode for additional energy savings.
The zone controller shall have a lockable keypad with the following three lockout levels to prevent
changes to the settings from the keypad:
BI1
Binary input no.1 configuration Default: None
(None): No function will be associated with the input. Point can still be monitored through the wireless network.
(Motion NO): Used in Occupied Mode only to toggle from the Occupied set points to the Stand-By set points when no motion is detected for 60 minutes at the zone.
As soon as motion is detected at the zone, the Occupied set points resumes.
Contact opened = No motion detected. Contact closed = Motion detected (Motion NC): Used in Occupied Mode only to toggle from the Occupied set points to the Stand-By set points when no motion is detected for 60 minutes at the zone.
As soon as motion is detected at the zone, the Occupied set points resumes.
Contact opened = Motion detected. Contact closed = No motion detected
The zone controller shall have a binary input that can be configured as follows:
The zone controller shall be capable of receiving the outdoor air temperature signal from the RTU
controller to lockout (if necessary) the zone’s analog reheat and/or the zone’s perimeter heating.
The zone controller shall have configurable temporary or permanent local override set points.
When the “temporary set points” mode is enabled, once the temporary occupancy timer expires, the set points will revert back to their default values.
The zone controller shall have adjustable maximum heating and minimum cooling set points to
prevent locking conditions at the Rooftop Unit controller by having set points that are not reachable.
Sequence of Operation –
The Viconics Wireless Zoning System shall operate in the following manner:
1. The VZ7656x1000W Rooftop Unit controller shall determine the mode of operation (heating / cooling) by analyzing the PI heating and PI cooling demand sent by the weighted VZ7260x5x00W zone controllers. The RTU controller shall supply heating or cooling based on the resulting analysis (highest demand, average of three highest demands or average of five highest demands). There is a mandatory two-minute delay between switchovers from heating to cooling to prevent cycling.
2. The Rooftop Unit controller shall also monitor the static pressure sensor and modulate the by­pass damper actuator accordingly to maintain the static pressure set point.
3. The Rooftop Unit controller shall monitor, return air temperature. If the high temperature limit or low cooling temperature limit occurs, the Rooftop Unit controller will shut off heating or cooling to prevent damage.
4. The Rooftop Unit controller shall monitor the outdoor air temperature and send the value to the zone controllers to allow outside air lockout conditions at the zone level.
5. The VZ7260 zone controller(s) shall send the actual PI heating or PI cooling value multiplied by the weight reduction factor (if necessary) to the Rooftop Unit controller.
6. The zone controllers shall modulate the local VAV damper to maintain the set point temperature. Using the integrated PI algorithm, the controller will determine if heating or cooling is required. If the particular zone has auxiliary reheat enabled, the auxiliary reheat (duct furnace and/or perimeter heater) will be used if necessary. If the Rooftop Unit is in cooling mode and supplying cold air and a particular zone requires cooling, the damper will modulate to supply the duct furnace enough air to heat to try and attain the heating set point.
7. The zone controllers will cycle (on the LCD screen) between outdoor temperature, actual Rooftop Unit occupancy and actual Rooftop Unit heating/cooling mode.
8. In case of a loss of network, the RTU unit will continue to control the Rooftop Unit based on the return air temperature.
9. The VWZS can be integrated to any BACnet MS_TP or BACnet_IP DDC central workstation with the addition of the Viconics Wireless Gateway (VWG-50-IP-5000 or VWG-50-MSTP-5000).
Sequence for economizer on VZ7656E1000Z only:
The fresh air damper can be controlled through more than one sequence to achieve different control strategies such as free cooling (economizer mode), minimum fresh air control and CO2 level control.
Note: For the sequences mentioned below, the following conditions must be met in order for the sequences to be performed as stated:
- Max Pos parameter value must be greater than Min Pos Parameter value.
- Mac CO2 parameter value must be greater than Min CO2 Parameter value.
- Max FA parameter value must be greater than Min FA Parameter value.
Economizer Control Mode Only
If the fresh air damper is to be used only for free cooling purposes (economizer mode, without fresh air measurement station or CO2 control), only the Min Pos parameter and the free cooling sequence will be active.
- The FA Range parameter should be set to 0 CFM. (Default Value = 0 CFM)
- Set the Chngstpt parameter to desired value which free cooling is enabled. (Default Value = 55°F)
If the outside air temperature is greater than the changeover setpoint, then normal mechanical cooling will be used. If the outside air temperature is less than or equal to the changeover setpoint, then free cooling will be enabled and mechanical cooling stages will be locked out.
Economizer Mode and Fresh Air Measurement Station
If the fresh air damper is to be used for both free cooling and minimum fresh air volume control (economizer mode and fresh air measurement station, but without CO2 level control), only the Min FA parameter and the free cooling sequence will be active.
- The FA Range parameter should be set to a value higher than 0 CFM (0 CFM disables the fresh air control).
- Min FA (minimum fresh air) parameter should be set to the desired level.
The FA Range parameter value should be set to the maximum capacity of the fresh air measurement station. Therefore the relationship between air volumes and input signals can be established. For example, if the fresh air station capacity is 10000 CFM, set FA Range to 10000.
This will set the relationship of 0 VDC = 0 CFM and 10VDC = 10000 CFM.
Min Pos
Max Pos
Min CO2
Max CO2
Current Fresh Air Setpoint
Current CO2 Level
Min FA
Setpoint
Max FA
Setpoint
Min CO2
Max CO2
Current
Current CO2 Level
Economizer Mode and CO2 Level Control
If the fresh air damper is to be used for both free cooling and CO2level control (economizer mode and CO2 level control, but without fresh air measurement station), only the Min Pos, Max Pos, Min CO2and Max CO2 parameters as well as the free cooling sequence will be active.
- The FA Range parameter should be set to 0 CFM.
- Set AI1 parameter to CO2 (0 VDC = 0ppm ; 10VDC = 2000ppm)
- Min Pos, Max Pos, Min CO2 and Max CO2 parameters should be set according to the required setting.
The highest value between free cooling demand output and interpolation output for the fresh air setpoint will be the output to the fresh air damper.
Economizer Mode, CO2 Level Control and Fresh Air Measurement Station
If the fresh air damper is to be used for both free cooling and CO2 level control with a fresh air measurement station, only the Min FA, Max FA, Min CO2 and Max CO2 parameters as well as the free cooling sequence will be active.
- The FA Range parameter should be set to something other than 0 CFM.
- Use an air flow transmitter to read fresh air level with AI2 input (0-5 VDC input)
- Min FA, Max FA, Min CO2 and Max CO2 parameters should be set according to the required setting.
The highest value between free cooling demand output and interpolation output for the fresh air setpoint based on the CO2 level will be the output to the fresh air damper
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